On the left menu bar, click on the heading 'Docs' Then, select 'Testimonials'

To add a new testimonial, click 'New testimonial' at the top right corner of the page.

Another way to create a new testimonial is by clicking on 'Quick add' on the down left corner of the page.

Then click on 'Testimonial' A shortcut for this is to press the 'q' and 't' on your keyboard.

You will then see a popup with empty information boxes that you can fill:
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Specialist
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Industries
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Practices
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Clients
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Language*
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Content*
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Notes

Once you have inserted all the necessary information, you can click 'New testimonial' at the bottom right corner of the popup to create the new testimonial.